附件是STM32F0單片機通過SPI方式驅動WS2811芯片進行彩燈控制的源代碼
單片機源程序如下:
- #include "stm32f0xx.h"
- #include "LED_SPI.h"
- uint16_t PixelBuffer[404] = {0};
- uint16_t PixelPointer = 0;
- void LED_SPI_LowLevel_Init(void)
- {
- uint16_t i = 0;
- GPIO_InitTypeDef GPIO_InitStructure;
- SPI_InitTypeDef SPI_InitStructure;
- DMA_InitTypeDef DMA_InitStructure;
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_DMA1, ENABLE);
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
- DMA_DeInit(DMA1_Channel3);
- DMA_InitStructure.DMA_BufferSize = 0;
- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) & (SPI1->DR);
- DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)PixelBuffer;
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
- DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
- DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
- DMA_Init(DMA1_Channel3, &DMA_InitStructure); /* DMA1 CH3 = MEM -> DR */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- /*
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- */
- GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_0);
- /* GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_0); */
- SPI_I2S_DeInit(SPI1);
- SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
- SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
- SPI_InitStructure.SPI_DataSize = SPI_DataSize_15b;
- SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
- SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
- SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
- SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8; /* 48MHz / 8 = 6MHz */
- SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
- SPI_InitStructure.SPI_CRCPolynomial = 7;
- SPI_Init(SPI1, &SPI_InitStructure);
- SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);
- SPI_Cmd(SPI1, ENABLE);
- for (i = 0; i < 404; i++)
- {
- PixelBuffer[i] = 0xAAAA;
- }
- PixelPointer = 0;
- }
- void LED_SPI_WriteByte(uint16_t Data)
- {
- /* Wait until the transmit buffer is empty */
- /*
- while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)
- {
- }
- */
- PixelBuffer[PixelPointer] = Data;
- PixelPointer++;
- /* Send the byte */
- /* SPI_I2S_SendData16(SPI1, Data); */
- }
- void LED_SPI_SendBits(uint8_t bits)
- {
- int zero = 0x7000; //111000000000000
- int one = 0x7F00; //111111100000000
- int i = 0x00;
- for (i = 0x80; i >= 0x01; i >>= 1)
- {
- LED_SPI_WriteByte((bits & i) ? one : zero);
- }
- }
- void LED_SPI_SendPixel(struct Pixel pixel)
- {
- /*
- r7,r6,r5,r4,r3,r2,r1,r0,g7,g6,g5,g4,g3,g2,g1,g0,b7,b6,b5,b4,b3,b2,b1,b0
- \_____________________________________________________________________/
- | _________________...
- | / __________________...
- | / / ___________________...
- | / / /
- RGB,RGB,RGB,RGB,...,STOP
- */
- /*
- BUG Fix : Actual is GRB,datasheet is something wrong.
- */
- LED_SPI_SendBits(pixel.green);
- LED_SPI_SendBits(pixel.red);
- LED_SPI_SendBits(pixel.blue);
- }
- ErrorStatus LED_SPI_Update(struct Pixel buffer[], uint32_t length)
- {
- uint8_t i = 0;
- uint8_t m = 0;
- if(DMA_GetCurrDataCounter(DMA1_Channel3) == 0)
- {
- for (i = 0; i < length; i++)
- {
- LED_SPI_SendPixel(buffer[i]);
- }
- if(length < 16)
- {
- for(i = 16 - length; i < length; i++)
- {
- for(m = 0; m < 3; m++)
- {
- LED_SPI_SendBits(0x00);
- }
- }
- }
- for (i = 0; i < 20; i++)
- ……………………
- …………限于本文篇幅 余下代碼請從51黑下載附件…………
所有資料51hei提供下載:
[STM32]WS281x_STM32F051 (1).zip
(312.45 KB, 下載次數: 213)
2018-4-20 15:36 上傳
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STM32F0驅動WS2811
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